COP21: Optimism growing at Paris climate change conference

December 1, 2015 7:24 PM

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COP21: Optimism growing at Paris climate change conference

Obama: historic gathering would have been 'pipe dream' just a few years ago

Among the flimsy particleboard walls and too-bright walkways at one of the climate-change exhibitions here in Le Bourget, an old hand like Al Gore seems right at home.

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